feat(editor): use $EDITOR instead of hardcoded zed#2

ericgoodwin wants to merge 3 commits into

jbachhardie:mainjbachhardie/gitopiary:mainfrom

ericgoodwin:03-31-feat_use_editor_env_var_instead_of_hardcoded_zed_for_editor_shortcutericgoodwin/gitopiary:03-31-feat_use_editor_env_var_instead_of_hardcoded_zed_for_editor_shortcutCopy head branch name to clipboard